Fire-alarm



- (N0 Modl.) 2'She'etsSheet 1.

J. W. ARNOLD.

FIRE ALARM. N0. 588,94Z.- Patented Aug. 31,1897.

(No Mbdel.) 2 Sheets-Sheet. 2.

J. W. ARNOLD.

FIRE ALARM.

No. 588,942. Patented Aug. 31,1897.

{UNITED STATES JOHN W'ESLEY ARNOLD, OF OTSEGO, MICHIGAN.

' FlRE-ALARM.

SPECIFICATION forming part of Letters Patent No. 588,942, dated August31, 1897.

Application filed April 29, 1897.

To all whom it may concern.-

Be it known that I, JOHN WESLEY ARNOLD, a citizen of the United States,residing at Otsego, in the county of Allegan and State of Michigan, haveinvented certain new and useful Improvements in Fire-Alarms; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itapio pertains to make and use the same.

My invention has relation to fire-alarms, and more particularly forsounding the firealarms in small villages and towns where the firedepartment is composed of volunteers I 5 comprising the residents.

The object of the invention is to provide an audible alarm which may beturned in from several parts of the town, thus not requiring a person torun to the en gine-house and sound it from that point, as is now thecommon custom.

With this object in view the invention consists of certain features ofconstruction and combination of parts, which will be hereinaf- 2 5 terfully set forth.

' In the accompanying drawings, Figure 1 is a side view of the tower,illustrating the application of my invention; and Fig. 2 is aview takenat right angles to Fig. 1.

In said drawings, 1 denotes the tower, to the upper end of which ismounted a bellframe supporting a bell 3.

4 denotes the spring actuated hammer, which is pivoted to a cross-bar 5and has its lower end in the path of the stud 6, secured to a disk wheel7, journaled in said frame.

8 denotes a shaft journaled beneath" this disk wheel, and to which isfixed a cog-wheel 9, meshing with a pinion 10, projecting laterally fromthe sides of the diskwheel. On the shaft of the cog-wheel 9 is a fixedsheave 11.

Secured below the top of the tower, to a platform 12, is a shaft 13,supporting a winding-drum 14: and a cog-wheel 15. This wheel 15 mesheswith a pinion 16 on a shaft 17, which carries an escapement-wheel 18.

19 denotes a cord or rope, which is wound around the drum and extendsupwardly and passes around the sheave or pulley 11. To the lower end ofthis rope is secured a weight 20.

The releasing device employed consists of a gear-wheel 21, secured to ashaft 22 and Serial No. 634,464. (No model.)

provided with a pinion 23, which meshes with a gear-wheel 24, having anarm 25, which projects laterally and engages the free end of anescapement-lever 26, which has its toe 27 in engagement with anescapement-wheel 18.

It is evident that when the free end of this lever is released theescapement-wheel 18 will be permitted to rotate, owingto the pull on thecord or rope by the weight 20, and that in the passing of the cord orrope around the sheave or pulley 11 the disk wheel will be rotated andsuccessively bring its pins or studs into engagement with the free endof the bellhandle, and thus sound the alarm. To release thisescapement-lever, I provide an electromagnet 28, the armature of whichis provided with a rod 29, that connects with a rod 30, secured to ashaft 81. This rod 30 is provided with a dog 32, which engages the wheel21 and prevents its rotation. The rod 30 is made of springmetal, so thatwhen its free end is released the dog 32 will spring from engagementwith the wheel 21 and allow it to 7 5 be rotated, ashereinafterdescribed.

In operation, when an alarm is sent in and the armature is attracted bythe magnet the dog 32 will be released from the-wheel 21, thus allowingthe inner end of the escape- 8o ment -lever 26 to press the arm 25 ofthe wheel 24 upward out of its way and allow the Wheel 18 to rotate inthe unwinding of the rope from the winding-drum. The wires from thiselectromagnet may extend to all the public buildings and principalcorners of the town or village and connect with a call-box, so thatshould a fire break out in any portion of the town all that is necessaryis to close the switch in the call-box and the alarm will be soundedfrom the tower of the engine-house.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-- A fire-alarm, comprising the following cssential elements, to wit; 1 a tower, a bell mounted therein, abell-clapper, a disk wheel provided with pins adapted to actuate theclapper, a gear-wheel for rotating the disk wheel, a pulley secured onthe shaft of the loo gearwheel, a winding-drum, a rope wound about'saidwinding-drum and passed over a pulley and provided with a weight movingin vertical guides, a gear-wheel 15 secured on the drum-shaft, a shaft17, a pinion 16 on said shaft in mesh with the Wheel 15, anescapement-wheel 18 on shaft 17, a shaft 22, a ratchet-wheel 21 and apinion 23 on said shaft 5 22, a Wheel 24E journaled below said shaft andengaging said pinion 23 and provided with an arm 25, apivoted lever 26having a toe 27 engaging Wheel 18 and having its other end held by arm25 against movement, a spring-rod 30 IO having a toe 32 that engages theWheel 21, an

electromagnet, the armature of which is provided with a rod 29 thatholds the rod 30 with its dog 32 in engagement with the wheel 21,substantially as set forth.

In testimony whereof I hereunto affix my I 5 signature in presence oftwo Witnesses.

J OIIN WESLEY ARNOLD. Witnesses:

ULYssEs S. ARNOLD, JOHN G. MoKAY.

